include/wx/mstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/mstream.h
   3 // Purpose:     Memory stream classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     11/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_WXMMSTREAM_H__
  13 #define _WX_WXMMSTREAM_H__
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_STREAMS
  18
  19 #include "wx/stream.h"
  20
  21 class WXDLLIMPEXP_BASE wxMemoryOutputStream;
  22
  23 class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  24 {
  25 public:
  26     wxMemoryInputStream(const void *data, size_t length);
  27     wxMemoryInputStream(const wxMemoryOutputStream& stream);
  28     virtual ~wxMemoryInputStream();
  29     virtual wxFileOffset GetLength() const { return m_length; }
  30     virtual bool IsSeekable() const { return true; }
  31
  32     char Peek();
  33
  34     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  35
  36     // deprecated, compatibility only
  37     wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
  38
  39 protected:
  40     wxStreamBuffer *m_i_streambuf;
  41
  42     size_t OnSysRead(void *buffer, size_t nbytes);
  43     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  44     wxFileOffset OnSysTell() const;
  45
  46 private:
  47     size_t m_length;
  48
  49     DECLARE_NO_COPY_CLASS(wxMemoryInputStream)
  50 };
  51
  52 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  53 {
  54 public:
  55     // if data is !NULL it must be allocated with malloc()
  56     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  57     virtual ~wxMemoryOutputStream();
  58     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  59     virtual bool IsSeekable() const { return true; }
  60
  61     size_t CopyTo(void *buffer, size_t len) const;
  62
  63     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  64
  65     // deprecated, compatibility only
  66     wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
  67
  68 protected:
  69     wxStreamBuffer *m_o_streambuf;
  70
  71 protected:
  72     size_t OnSysWrite(const void *buffer, size_t nbytes);
  73     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  74     wxFileOffset OnSysTell() const;
  75
  76     DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  77 };
  78
  79 #endif
  80   // wxUSE_STREAMS
  81
  82 #endif
  83   // _WX_WXMMSTREAM_H__
  84